Process of forming cores



(No Mode-I.)

J. J. CARR.

PROCESS OP FORMING GORES.

No. 898,208. Patented Nov. zo, 1888. 8

Naf

'//////// v Al III/y n. Psmzs mwunwgnpm wmingmn. nu

` UNi'rED STATES ATENT FFICE.

JOSEPH J. CARR, OF VILKES-BARR, PENNSYLVANIA.

PROCESS OF FORMING CORES.

SPECIFICATION forming part of Letters Patent No. 393,208, dated November -2O, 1888.

Application filed May 7, 1888. Serial No. 273,090.

To @ZZ whom it may concern.:

Be it known that I, JOSEPH J. GARR, a citizen of the United States, and a resident of Wilkes-Barr, Luzerne county, Pennsylvania, have invented an Improved Process of Forming Cores, of which the following is a specift cation.

The object of my invention is to rapidly and accurately form cores for molding pipe I and similar structures by compressing the sand in a core box by means of an expanding corebarrel, as fully described hereinafter.

Heretofore cores have generally been made by placing on a central core shell or stick the necessary material for making the core-sand, for instance-and packing this from the exterior by hand, and then when a certain amount of sand is applied to the body of the core the superfluous sand is scraped off by means of a stationary scraper and the coreitself revolved against the scraper until the correct diameter is obtained. This process is very laborious and occupies considerable time, and is not at all times correct. I overcome this difficulty and proceed in the following manner with the following devices, reference being had to the accompanying drawings, in which- Figure l is a longitudinal section of my improved core-box and central core-barrel contracted, with the sand between the central core-barrel and the mold or box. Fig. 2 is a longitudinal section with the core-barrel eX- tended to its fullest diameter, compressing the sand between it and the core-box. Fig. 3 is a transverse section on the line 3 8, Fig. 1. Fig. 4 isa transverse section on the line 4. 4, Fig. 2. Fig. 5 is a View of a portion ofthe pipe-mold and the core in position therein, showing the cast pipe between the mold and the core; and Fig. 6 is a modified form of compressor for the flange-core. Fig. 7 is a view of one of the bearings, showing the hinged cap.

Referring to Fig. l, A is the base plate or table on which the device is mounted, and a c are suitable bearings for the central tubular shaft or core barrel, B. The bearings have hinged or movable caps, so that the whole device can be lifted from the bearings, for a purpose described hereinafter.

Secured to the base-plate A is the drag or lower half of the core-box D, and attached to this box in any suitable manner is the up- (No model.)

per portiony or cope, D', of the box. These two sections, in the present instance, are secured together by means of hinges on oneside and slip-bolts passing through lugs on the other side.

Themolds in the present instance are made to form what is known as a large steam-pipe, this pipe having large flanges at each end, through which bolts pass, theiiianges being faced to make a tight joint; but it will be understood at the outset that any shape of pipe may be formed, the shape of the pipedepending altogether upon the formation of the corebox and pipe-mold. l

' The shaft B passes centrally through the core-box and` is hollow, and through the center of this hollow shaft is a shaft, E, having screw-threads c c at each outer end, and adapted to these screws are suitable nuts, F F.

f Secured to the operating-shaftE are, in the present instance, two sleeves, b b, and pivoted to these sleeves are links c c, pivoted in turn to lugs on the corebarrel proper, C C. This core-barrel is made in this instance in four sections, each connected to the operatingshaft by independent links. The adjoining sections of the core-ba rrel overl ap each other, as shown in the transverse section, Fig. 3, so that the joints will be broken. This core-barrel has a number of perforations in its periphery to allow for the escape of the gases produced in casting, and also has a series of lugs on its periphery, by which the molding-sand is retained in position on the barrel. Each of these sections is provided with pins f f, radiating toward the center and adapted to slide in orifices in the hollow shaft B, so that each section of the core-barrel is guided by this hollow shaft.

Referring to Fig. l, if the nuts F F are turned in the direction of the arrow, it will cause the operating-shaft E to move in the direction of its arrow, expanding the core to the position shown in Fig. 2; but if the nuts F F are turned in the direction of the arrow, Fig. 2, it will contract the core, as shown in Fig. l. On the shaft B is a sleeve, H, having a wide llange, h. This flange is of the same diameter as the enlarged end portions, cl (Z, of the core-box D D. In the rear of the sleeve H is a handled nut, I, adapted to ascrew-thread on the shaft B. By turning this nut in one di- IOO rection it will force the sleeve and its flange toward the core-box. This ange 7a forms the core for the flange of the pipe, and the sand to form this portion of the core is compressed at the same time the body of the core is compressed.

In the drawings I haveshown two sleeves, H H; but in some cases only one sleeve may be used when it is desired to make single-hanged pipe.

Y In place of the nut and screw on the shaft a. plate, I-I, may be secured to the shaft and toggle-levers z' inserted between the plate and the ilange h 0r h', and a link, i', may be used for connecting the toggles with a Iixed sleeve on the operatingshaft E, so that simultaneously with the movement of the sections of core-barrel the flanges 71, h will also move, as shown in Fig. 6. 4

The mode of operation is as follows: The cope portion D of the core-box is removed, and also the central. expanding core. cient sand is placed in the drag to supply onehalf ofthe core, and is then shaped as nearly as possible by means of a sweep. The contracted core is placed in position on its bearings and sand is then packed upon this corebarrel, after which a second sweep is used to clear off the superfluous sand. The cope is then placed in position and locked to the drag. The nuts are turned, expanding the core-barrel from the position shown in Fig. l to that shown infFig. 2, compressing the sand between the core-box and core-barrel. The openings andthe projections on the core-barrel prevent the displacement of the sand. Simultaneously with the expanding of the corebarrel the end flanges, h h', are moved, compressing the sand to form the core for the suffi-ff mold proper and the core, thus forming the pipe, as shown by heavy black lines in Fig. 5,l

after which the core-barrel-is retracted by releasing the operating-shaft and can be readily pulled out from the cast pipe, as inordinary pipe-molding.

I claim as my invention- I. The mode herein described of forming cores for casting pipe and similar articles, said mode consisting in providing a core-box of the shape of the pipe to be cast, inserting therein an expansible core-barrel in its contracted form,fillng the space between the contracted core-barrel an'd corebox with sand or similar casting material, and expanding said core-barrel, thus compressing the sand to the proper density, substantially as set forth.

2. The mode herein described of forming cores for casting flanged pipe, said mode consisting in providing a core-box of the shape of the pipe to be cast, a collapsible core-barrel with movable llanges, packing sand or other material between the core-barrel flanges and core-box, and expanding the core-barrel and moving the llanges toward the core-box, so as to compress the sand into the compact form required, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JosRPH J.' CARR.

Vitnesses:

HARRY SMITH, HENRY HoWsoN. 

